Display screen portion with transitional user interface



FIG. 1 is a front view of the first image in the sequence for atransitional user interface for a portion of a display screen showingthe new design; and,

FIG. 2 is a front view of the second image thereof.

The appearance of the transitional image sequentially transitionsbetween images shown in FIGS. 1-2. The process or period in which oneimage transitions to another forms no part of the claimed designed. Thebroken line showing of a portion of a display screen, shapes and text isincluded for the purpose of illustrating environment and forms no partof the claimed design.

The ornamental design for a display screen portion with transitionaluser interface, as shown and described.